The entire arc has a 180° angle.Ī triangle is a closed polygon with three sides, three vertices, and three angles. The curved line’s points are at equal distances from its centre.Ī semi-circle has two sides, one curved and one straight. Let us look at a few of them and their properties.Ĭircles are entirely round shapes formed by a single curved line. Regular and irregular 2D shapes include the circle, triangle, square, rectangle, pentagon, and hexagon.
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